x)Sr0.2Na0.4Sm0.4TiO3-em class="EmphasisTypeItalic">xLnAlO3 samples (where Ln stands for Nd, Pr and Sm, x?=?0.2-.3) were studied. The XRD result showed that the (1???em class="EmphasisTypeItalic">x)Sr0.2Na0.4Sm0.4TiO3-em class="EmphasisTypeItalic">xLnAlO3 (Ln?=?Nd, Pr and Sm) solid-solutions with single orthorhombic perovskite phase could be formed in the componential range of 0.2?≤?em class="EmphasisTypeItalic">x?≤?.3. With an increasing of Ln3+ content, the dielectric constant (ε r ) decreased due to the smaller dielectric?polarizability of LnAlO3 than that of Sr0.2Na0.4Sm0.4TiO3. With increasing x from 0.2 to 0.3, the quality factor (Q·f)?firstly?increased and?then?decreased for the specimens with PrAlO3, because the Q·f values were strongly depended on grain sizes. Moreover, either increasing the A-site bond valence or decreasing the B-site bond valence led to a decrease in the temperature coefficient of the resonant frequency (τ f). Typical values of ε r?~?52.7, Q·f?~?9700?GHz (at 4.33?GHz) and τ f?~?1.5?ppm/°C were obtained for the (1???em class="EmphasisTypeItalic">x)Sr0.2Na0.4Sm0.4TiO3-em class="EmphasisTypeItalic">xSmAlO3 (x?=?0.25) ceramic sintered at 1470?°C for 4?h." />
Microstructures and microwave dielectric properties of (1???em class="a-plus-plus">x)Sr0.2Na0.4Sm0.4TiO3-em class="a-plus-plus">xLnAlO3 (Ln?=?Nd, Pr and Sm) ceramic systems
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  • 作者：Jingjing Qu ; Changlai Yuan ; Fei Liu…
  • 刊名：Journal of Materials Science: Materials in Electronics
  • 出版年：2015
  • 出版时间：July 2015
  • 年：2015
  • 卷：26
  • 期：7
  • 页码：4862-4869
  • 全文大小：2,603 KB
  • 参考文献：1.C.F. Tseng, C.C. Huang, Microwave dielectric properties of (1???em class="EmphasisTypeItalic">x)Nd(Co1/2Ti1/2)O3-em class="EmphasisTypeItalic">x(Ca0.8Sr0.2)TiO3 composite ceramics. J. Mater. Sci. 47, 3982-988 (2012)View Article
    2.Changlai Yuan, Guohua Chen, Tao Yang et al., Microstructures and microwave dielectric properties of low-temperature fired Ca0.8Sr0.2TiO3–Li0.5Sm0.5TiO3 ceramics with Bi2O3-B2O3 addition. J. Electron. Mater. (2014). doi:10.-007/?s11664-014-3422-9
    3.C.H. Hsun, S.H. Tsai, Dielectric characteristics of Sr substitution on Ca0.4Sm0.4TiO3 ceramics at microwave frequency. Ceram. Int. 40, 10111-0114 (2014)View Article
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    6.A. Manan, I. Qazi, A. Ullah, Preparation, characterization, and microwave dielectric properties of Sr2La3Nb1?em class="EmphasisTypeItalic">x Ta x Ti4O17 (0?≤?em class="EmphasisTypeItalic">x?≤?) ceramics. J. Electron. Mater. 42, 138-42 (2013)View Article
    7.J. Li, Y. Han, T. Qiu, C. Jin, Effect of bond valence on microwave dielectric properties of (1???em class="EmphasisTypeItalic">x)CaTiO3-em class="EmphasisTypeItalic">x(Li0.5La0.5)TiO3?ceramics. J Mater. Res. Bull. 47, 2375 (2012)View Article
    8.D.A. Abdel Aziz, I. Sterianou, I.M. Reaney, (1???em class="EmphasisTypeItalic">x)CaTiO3-em class="EmphasisTypeItalic">x(Li0.5Nd0.5)TiO3?for ultra-small dielectrically loaded antennas. J. Mater. Sci. 44, 6247 (2009)View Article
    9.B. Jancar, D. Suvorov, M. Valant, G. Drazic, Characterization of CaTiO3–NdAlO3 dielectric ceramics. J. Eur. Ceram. Soc. 23, 1391-400 (2003)View Article
    10.G.A. Ravi, F. Azough, R. Freer, Effect of Al2O3 on the structure and microwave dielectric properties of Ca0.7Ti0.7La0.3Al0.3O3. J. Eur. Ceram. Soc. 27, 2855-859 (2007)View Article
    11.C.L. Huang, H.L. Chen, C.C. Wu, Improved high Q value of CaTiO3–Ca(Mg1/3Nb2/3)O3 solid solution with near zero temperature coefficient of resonant frequency. Mater. Res. Bull. 36, 1645-652 (2001)View Article
    12.C.H. Hsu, H.A. Ho, Microwave dielectric in the Sm(Co1/2Ti1/2)O3–CaTiO3 ceramic system with near-zero temperature coefficient with resonant frequency. Mater. Lett. 64, 396-98 (2010)View Article
    13.E.A. Nenasheva, L.P. Mudroliubova, N.F. Kartenko, Microwave dielectric properties of ceramics based on CaTiO3–LnMO3 system (Ln–La, Nd; M-Al, Ga). J. Eur. Ceram. Soc. 23, 2443-448 (2003)View Article
    14.C.F. Tseng, C.L. Huang, W.R. Yang, Microwave dielectric properties of xNd(Zn1/2Ti1/2)O3-1???em class="EmphasisTypeItalic">x)CaTiO3 ceramics. Mater. Lett. 61, 4054-057 (2007)View Article
    15.F. Liu, X.Y. Liu, C.L. Yuan et al., Crystal structure and dielectric properties of (1???em class="EmphasisTypeItalic">x)SrTiO3-em class="EmphasisTypeItalic">xCa0.4Sm0.4TiO3 ceramic system at microwave frequencies. Mater. Chem. Phys. 148, 1083-088 (2014)View Article
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  • 作者单位：Jingjing Qu (1)
    Changlai Yuan (2)
    Fei Liu (2) (3)
    Xinyu Liu (2) (3)
    Guohua Chen (2)
    Panpan Qin (2)

    1. Department of Information Engineering, Guilin University of Aerospace Technology, Guilin, 541004, People’s Republic of China
    2. College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, People’s Republic of China
    3. College of Material Science and Engineering, Central South University, Changsha, 410083, People’s Republic of China
  • 刊物类别：Chemistry and Materials Science
  • 刊物主题：Chemistry
    Optical and Electronic Materials
    Characterization and Evaluation Materials
  • 出版者：Springer New York
  • ISSN：1573-482X
文摘
The microstructures and microwave dielectric properties of the (1???em class="EmphasisTypeItalic">x)Sr0.2Na0.4Sm0.4TiO3-em class="EmphasisTypeItalic">xLnAlO3 samples (where Ln stands for Nd, Pr and Sm, x?=?0.2-.3) were studied. The XRD result showed that the (1???em class="EmphasisTypeItalic">x)Sr0.2Na0.4Sm0.4TiO3-em class="EmphasisTypeItalic">xLnAlO3 (Ln?=?Nd, Pr and Sm) solid-solutions with single orthorhombic perovskite phase could be formed in the componential range of 0.2?≤?em class="EmphasisTypeItalic">x?≤?.3. With an increasing of Ln3+ content, the dielectric constant (ε r ) decreased due to the smaller dielectric?polarizability of LnAlO3 than that of Sr0.2Na0.4Sm0.4TiO3. With increasing x from 0.2 to 0.3, the quality factor (Q·f)?firstly?increased and?then?decreased for the specimens with PrAlO3, because the Q·f values were strongly depended on grain sizes. Moreover, either increasing the A-site bond valence or decreasing the B-site bond valence led to a decrease in the temperature coefficient of the resonant frequency (τ f). Typical values of ε r?~?52.7, Q·f?~?9700?GHz (at 4.33?GHz) and τ f?~?1.5?ppm/°C were obtained for the (1???em class="EmphasisTypeItalic">x)Sr0.2Na0.4Sm0.4TiO3-em class="EmphasisTypeItalic">xSmAlO3 (x?=?0.25) ceramic sintered at 1470?°C for 4?h.

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